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20 DATA LOGGING FUNCTION
20.7 States of the Data Logging Function
*1 The execution of another function includes:
Execution of data logging with the same trigger conditions (trigger conditions = the specified conditions)
Auto logging
Online change
■Data logging states at system switching
The following table lists the data logging states that change at system switching.
• When the control system is switched to the standby system
• When the standby system is switched to the control system
Before using the data logging function, check if the SD memory card inserted in the CPU module of the
standby system has sufficient free space with a program. When the SD memory card inserted in the CPU
module of the standby system does not have sufficient free space and the systems are switched, an error
occurs at the data collection in the new control system and the data collection is finished.
To prevent occurrence of an error, use a program that turns on the annunciator when the free space of the SD
memory card of the standby system is smaller than the value of the criteria, such as the one shown below.
• For the above program, set "Both Systems Executions" for "Both Systems Program Executions Setting" of
the CPU parameter. ( Page 418 Program Execution in Both Systems)
• Set the value of the criteria in D0 in increments of K of the double word [unsigned].
Before system switching (old control system) After system switching (new standby system)
Start waiting (no collection) Standby system start waiting
Pause Standby system pause
Condition waiting (no collection) Standby system no collection
Collecting
Trigger waiting (Collecting before trigger)
Collecting after trigger
Before system switching (old standby system) After system switching (new control system)
Standby system start waiting Start waiting (no collection)
Standby system pause Pause
Standby system no collection Condition waiting (no collection)
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